TWI483624B - Method and system of equalization pre-processing for sound receiving system - Google Patents

Method and system of equalization pre-processing for sound receiving system Download PDF

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Publication number
TWI483624B
TWI483624B TW101109309A TW101109309A TWI483624B TW I483624 B TWI483624 B TW I483624B TW 101109309 A TW101109309 A TW 101109309A TW 101109309 A TW101109309 A TW 101109309A TW I483624 B TWI483624 B TW I483624B
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TW
Taiwan
Prior art keywords
sensitivity curve
unit
radio
equivalent circuit
sensitivity
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TW101109309A
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Chinese (zh)
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TW201340733A (en
Inventor
Cheng Hui Hsieh
Yu Cheng Liu
jin huang Huang
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Universal Scient Ind Shanghai
Universal Global Scient Ind Co
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Priority to TW101109309A priority Critical patent/TWI483624B/en
Publication of TW201340733A publication Critical patent/TW201340733A/en
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Publication of TWI483624B publication Critical patent/TWI483624B/en

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Classifications

    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G5/00Tone control or bandwidth control in amplifiers
    • H03G5/16Automatic control
    • H03G5/165Equalizers; Volume or gain control in limited frequency bands
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00Monitoring arrangements; Testing arrangements
    • H04R29/004Monitoring arrangements; Testing arrangements for microphones
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
    • H04R1/222Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R29/00Monitoring arrangements; Testing arrangements
    • H04R29/004Monitoring arrangements; Testing arrangements for microphones
    • H04R29/005Microphone arrays
    • H04R29/006Microphone matching
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/005Circuits for transducers, loudspeakers or microphones for combining the signals of two or more microphones

Description

Equalization pre-processing method and system for radio system

The invention relates to an equalization pre-processing method and system, and in particular to an equalization pre-processing method and system for a radio system.

With the rapid development of the technology industry, electronic products such as mobile phones, PDAs, MP3s, tablets and notebook computers are paying more and more attention to sound quality. In order to respond to the diversified functions of electronic products and towards the trend of miniaturization, the space occupied by many sound components is compressed in design, and even for different needs, different positions must be placed on the product by the sound guide tube. The sound system of shape, shape and length, and the sound system formed by the sound propagation through the sound tube is generally called the sound collection system.

For example, please refer to FIG. 1 , which illustrates a cross-sectional view of a typical condenser microphone (Condenser Microphone) radio system. The typical condenser microphone radio system 10 architecture includes a microphone unit and a waveguide 101. During the system assembly process, there is a shockproof and airtight rubber rubber 103 and the microphone unit is provided with dustproof or A paper 105 for waterproofing. The microphone unit includes a diaphragm 107 having a sound hole before, a ring 109 forming a front cavity, a diaphragm 111 for generating sound waves by being squeezed by air, and a spacer 113 having A back plate 115 of a plurality of sound holes, a plastic holder 117, a copper holder 119, a back chamber 121, a printed circuit board 127 connected to the copper holder 119, and a circuit board are disposed on the circuit. A field effect transistor (FET) 123 and a capacitor 125 for amplifying the sound voltage signal on the board 127. The necessary components of these radio systems significantly affect the frequency response of the receiving and receiving system, that is, the sensitivity of the radio system. Therefore, the sound pickup characteristics of the general microphone unit are related to the design of the sound guide tube in addition to the microphone body. In addition, in order to make the microphone of the electronic product meet the current new Wideband voice test regulations, the sensitivity curve of the microphone sound tube design between 100 Hz and 8 kHz must be Need to be relatively flat.

However, in the current microphone unit in the radio system, the microphone sensitivity is often over-amplified at some frequencies due to poor design, resulting in sound distortion, and the radio reception effect usually has to wait until the mechanism is opened before the actual measurement can be obtained. Specifically, it is difficult for the system designer to obtain various parameters such as the internal components of the microphone unit designed and manufactured by the microphone unit, so that the system designer cannot perform the sound tube analysis under the condition that the internal parameters of the microphone unit are unknown. Accordingly, the current radio system design is based on the past experience to continuously test and verify all kinds of new products, and then modify. As a result, not only is it easy to delay the product development time and increase the cost, but also can not effectively reflect the customer's needs in a timely manner.

The invention provides an equalization pre-processing method for a radio system, which can analyze an unknown radio unit by using a radio unit with known internal parameters to obtain an unknown radio through an equivalent circuit method and an equalization processing method. The characteristics of the unit in a radio system.

Embodiments of the present invention provide a pre-processing method for a radio system, which is adapted to analyze a characteristic of a second radio unit in a radio system by analyzing a first radio unit configured with a known internal structure. The method includes: firstly, according to the first radio unit structure configuration parameter, establishing a first equivalent circuit model corresponding to the first radio unit; secondly, measuring and capturing the first sensitivity curve of the first radio unit and the first a second sensitivity curve of the second radio unit; then, equalizing the second sensitivity curve into a first sensitivity curve, and obtaining a difference value between the first and second sensitivity curves; thereafter, simulating the first equivalent circuit model, And obtaining a third sensitivity curve of the first sound receiving unit in the sound receiving system; receiving, the third sensitivity curve obtained by the simulation is correspondingly compensated according to the difference value between the first and second sensitivity curves; and finally, acquiring the second sound receiving The fourth sensitivity curve of the radio system is used by the unit and the characteristic of the second radio unit in the radio system is analyzed through the fourth sensitivity curve.

The embodiment of the invention further provides an equalization pre-processing system for the radio system, which is used for calculating and analyzing the first sensitivity curve and the second sensitivity curve input by the first radio unit and the second radio unit through the measurement module. . The equalization pre-processing system of the radio system includes an equivalent circuit model establishing unit, an equalization calculation unit, a storage unit, a radio system simulation unit, and a compensation processing unit. The equivalent circuit model establishing unit establishes a first equivalent circuit model according to the internal structure configuration relationship and material parameters known by the first sound unit, and outputs a first analog sensitivity curve. The equalization calculation unit can be used to determine the accuracy of the first analog sensitivity curve and equalize the second sensitivity curve to the first sensitivity curve, thereby generating corresponding sensitivity difference data. The storage unit is coupled to the equalization calculation unit for storing the sensitivity difference data between the first sensitivity curve and the second sensitivity curve. The radio system simulation unit can simulate generating a third sensitivity curve corresponding to the first radio unit in a radio system according to the first equivalent circuit model and the equivalent circuit model of the corresponding sound tube. The compensation processing unit is coupled to the storage unit and the sounding system simulation unit for compensating the third sensitivity curve obtained by the simulation according to the sensitivity difference data between the first sensitivity curve and the second sensitivity curve, and generating a second sounding unit The fourth sensitivity curve corresponding to the radio system.

In one embodiment of the present invention, the first sound pickup unit and the second sound pickup unit may be one of a condenser microphone, a piezoelectric microphone, a moving coil microphone, and a micro electro mechanical microphone.

In summary, the present invention provides an equalization pre-processing method for a radio system. The pre-processing method utilizes a sensitivity equalization method and an equivalent circuit method under an internal parameter condition of an unknown radio unit (eg, a microphone). The simulation and analysis of its radio characteristics enable electronic product designers to accurately and quickly grasp the characteristics of the radio system of unknown radio units (such as microphones) before the mold development, to meet the radio quality requirements of the application products. Reduce the time required to develop a microphone sound system and reduce development costs.

The detailed description of the present invention and the accompanying drawings are to be understood by the claims The scope is subject to any restrictions.

Embodiments of the present invention provide a pre-processing method for a radio system, which can effectively perform an analysis of a radio system, and accurately grasp the performance of the product, thereby saving product development time and cost.

[Equivalent Circuit Example of Capacitive Microphone Radio System]

Referring to FIG. 2 and FIG. 1 simultaneously, FIG. 2 is an equivalent circuit diagram of the condenser microphone receiving system shown in FIG. 1 according to an embodiment of the present invention. The condenser microphone radio system 10 includes a sound guide tube 101 and a microphone unit as described above. The equivalent circuit 20 of the condenser microphone radio system 10 is established by an equivalent circuit method, and can be used for simulating and analyzing the characteristics of components and structures of a radio system and the influence on sound transmission, such as a sensitivity curve, thereby enabling different radios. The system characteristics are simulated and analyzed, and the design of the sound tube mechanism corresponding to the microphone unit (for example, pipe diameter and pipe length, etc.) is obtained.

The equivalent circuit 20 of the condenser microphone receiving system 10 includes an equivalent circuit 21 including air radiation impedance, an acoustic equivalent circuit 23 of the sound tube, a cavity single cavity acoustic equivalent circuit 25a, and a microphone unit rear cavity. The acoustic equivalent circuit 25b, the mechanical equivalent circuit 27 of the microphone unit, and the electrical equivalent circuit 29 of the microphone unit. The microphone unit front and rear cavity acoustic circuits 25a, 25b, the microphone unit mechanical equivalent circuit 27 and the microphone unit electrical circuit 29 can be coupled via a transformer and energy conversion.

Further, the sound pressure source P represents the intensity of an external sound pressure (for example, a voice spoken by a person). The equivalent circuit 21 of the air radiation impedance is used to indicate an equivalent circuit of the radiation impedance generated by the sound pressure pushing the air when the external sound pressure (ie, the sound pressure source P) is generated. The acoustic equivalent circuit 23 of the sound tube is an equivalent circuit model of the sound tube, which is used to represent the effect of the internal structure and size of the sound tube corresponding to the sound pressure. The microphone unit front and rear cavity acoustic equivalent circuits 25a, 25b, the microphone unit mechanical equivalent circuit 27 and the microphone unit electrical equivalent circuit 29 are microphone unit equivalent circuit models for representing the microphone unit The internal structure, size and material properties correspond to the effects of sound pressure.

In detail, as shown in FIG. 2, the equivalent circuit 21 of the air radiation impedance is composed of an acoustic radiation mass such as an equivalent inductance Ma-rad and an acoustic radiation impedance, for example, equivalent. The parallel circuit formed by the resistor R a-rad is represented.

The acoustic equivalent circuit 23 of the sound tube includes an acoustic element (e.g., acoustic quality) generated by the sound pressure inside the sound tube 101. The acoustic elements of the sound tube 101 can be represented by impedance equivalent circuit elements, for example, using equivalent circuits ( Zwg1 and Zwg2 ) of a T-network. In addition, the sound guide tube 101 can analyze the sound pressure and the volume change speed of the both ends of the entrance and exit of the sound tube 101 by using an Exact Method, for example, and integrate a T-matrix calculation method to accurately analyze. The characteristics of the sound tube 101 and its influence on the sensitivity of the sound pickup system.

Next, the microphone unit front cavity acoustic equivalent circuit 25a includes an acoustic element generated by the sound pressure passing through the rubber pad 103, acoustic quality and acoustic damping generated by the sound pressure transmitted through the sound hole of the front cover 107 in the wall of the hole pipe, and The acoustic pressure passes through the acoustic elements (eg, acoustic mass) produced by the copper ring 109. As shown in FIG. 2, the capacitance C apr represents the acoustic compliance of the change in the front cavity volume velocity caused by the sound pressure passing through the rubber pad 103. The acoustic mass and Acoustic resistance generated in the wall of the hole can be represented by a series circuit composed of the inductor M co and the resistor R aco . In addition, the cavity formed by the copper ring 109 may have a capacitance C ri to represent the acoustic compliance of the sound pressure generated by the copper ring 109 to cause a change in the volume velocity of the front cavity. The series circuit of the inductor M co and the resistor R aco is further connected in series with the capacitor C ri and the capacitor C apr .

The sound pressure source P is connected in series with the equivalent circuit 21 of the air radiation impedance, and is connected in parallel with the cavity acoustic equivalent circuit 25a of the microphone unit. Specifically, the sound pressure source P is connected in series with the equivalent circuit of the air radiation impedance; the series circuit of the sound pressure source P and the equivalent circuit of the air radiation impedance is further connected to the T-type network equivalent circuit of the sound tube 101 and A series circuit formed by an inductor M co , a resistor R aco capacitor C ri , and a capacitor C apr .

In addition, the microphone unit after the cavity acoustic equivalent circuit 25b includes a damping effect generated by simulating the sound pressure pushing the diaphragm 111 to press the air gap, and the simulated air flows through the sound hole provided on the back plate 115. The resulting acoustic mass and damping effects as well as the acoustic compliance effects produced by the back cavity 121. Accordingly, the microphone unit rear cavity acoustic equivalent circuit 25b is an equivalent circuit formed by the resistor R ag , the inductor M app , the resistor R app and the capacitor C bc connected in series to correspond to the internal structure of the microphone unit. The mechanical equivalent circuit 27 of the microphone unit simulates the mass, resistance and compliance effects of the diaphragm 111 by connecting the inductor M D , the resistor R D and the capacitor C D in series.

The electrical equivalent circuit 29 of the microphone unit can be connected in series by the capacitors C eo and -C eo to simulate the electrical signal e oc of the sensed microphone unit, and the electrical equivalent circuit 29 is represented by an open circuit. .

As described above, the microphone unit front cavity equivalent circuit 25a and the microphone unit mechanical circuit 27 are coupled and converted by a transformer having a conversion ratio of 1:A D. The mechanical circuit 27 of the microphone unit and the acoustic circuit 25b of the microphone unit are coupled and converted by a transformer having a conversion ratio of A D :1. The mechanical circuit 27 of the microphone unit and the electrical equivalent circuit 29 of the microphone unit are coupled and converted by a transformer having a conversion ratio of 1:φ.

Through the above description, those skilled in the art can know how to derive and simplify the equivalent circuit 20 of the condenser microphone receiving system, for example, energy conversion through a conversion factor and serial and parallel circuits of complex equivalent circuit components. Loop and equivalent circuit analysis (such as the derivation of equations) and simulation.

It is worth mentioning that, in this embodiment, the condenser microphone receiving system is used as an equivalent circuit method, but the equivalent circuit method can also be applied to other types of microphone receiving systems, for example, a piezoelectric microphone, A dynamic microphone or a MEMS Microphone or other radio system with a radio effect. In addition, those skilled in the art should be aware that the actual equivalent circuit architecture will vary depending on the type and physical architecture of the microphone unit, and other types of microphone radio systems or other equivalent radios should be inferred from the equivalent circuit of FIG. The equivalent circuit construction method of the system is not repeated here.

Incidentally, other analysis methods may be used for the analysis method of the sound guide tube 101, for example, a Multiple Slice Approximate Method and an Acoustic Mass and Resistance Series Method. The multi-segment approximation uses the concept of segment continuation to divide the entire sound tube 101 into a plurality of T-shaped matrices and connected in parallel to analyze the characteristics of the sound tube 101. The series analysis method integrates the acoustic mass (Acoustic Mass) generated by the sound pressure in the sound tube in series with the acoustic impedance (Acoustic Resistance). In other words, the equivalent circuit model of the sound tube 101 is also changed by the analysis method used, and the analysis method of the sound tube is not limited to the invention, and the general knowledge of the present invention should be able to infer the multi-segment approximation. The implementation of the method and the series analysis method and the corresponding equivalent circuit architecture are not described herein.

In summary, the equivalent circuit model of the radio system can be changed by the type of analysis and the type and structure of the radio system. Therefore, FIG. 2 is only an equivalent circuit diagram of a condenser microphone receiving system, and is not intended to limit the present invention.

[Equivalent pre-processing system embodiment for radio system]

Please refer to FIG. 3. FIG. 3 is a functional block diagram of an audio processing system according to an embodiment of the present invention. The audio processing system 30 includes an equivalent circuit model establishing unit 31, a first sounding unit 33, a second sounding unit 35, a measuring module 37, and an equalizing pre-processing system 39. The first sound pickup unit 33 and the second sound pickup unit 35 are implemented by a condenser microphone unit in this embodiment. The internal structural configuration, relative dimensional relationship, and material parameters of the first sound unit 33 (ie, the first microphone) are known, for example, the parameters of the internal components of the microphone unit obtained by the single design manufacturer. The internal structure and sound pickup characteristics of the second sound pickup unit 35 (i.e., the second microphone) are unknown, and must be obtained by analysis by the equalization pre-processing system 39. In other words, the audio processing system 30 can use a known condenser microphone unit (ie, the first sound pickup unit 33) to establish an equivalent circuit of the corresponding sound system by using the foregoing equivalent circuit architecture, and simulate through the equalization calculation and sound system. The characteristics of the unknown condenser microphone unit (ie, the second sound unit 35) in a radio system are inferred.

The first sound pickup unit 33 and the second sound pickup unit 35 respectively transmit sound data to the measurement module 37. In addition, the equivalent circuit model establishing unit 31 and the measuring module 37 are respectively coupled to the equalizing pre-processing system 39. Accordingly, the pre-processing system 39 can receive the sound sensitivity data of the first sound pickup unit 33 and the second sound pickup unit 35 and perform analysis and simulation of the characteristics of the related sound collection system.

The equivalent circuit model establishing unit 31 can establish the first equivalent of the condenser microphone unit as shown in FIG. 2 according to the internal structure configuration, the relative size relationship, and the material parameters of the first sound pickup unit 33 (ie, the first microphone). The circuit model (ie, the microphone unit front cavity acoustic equivalent circuit 25a, the rear cavity acoustic equivalent circuit 25b, the microphone unit mechanical equivalent circuit 27, and the microphone unit electrical equivalent circuit 29), and outputs the relevant simulation The data (e.g., known equivalent element parameters such as acoustics, mechanics, and electrical, and the first analog sensitivity curve of the first sound unit 33) are fed to the equalization pre-processing system 39.

The measurement module 37 can be used to actually measure and capture a first sensitivity curve corresponding to the first sound unit 33 (ie, the first microphone) and a second sensitivity curve of the second sound unit 35 (ie, the second microphone), and The input is input to the equalization pre-processing system 39 for comparative analysis.

Incidentally, the first sensitivity curve and the second sensitivity curve are frequency response curve data of the first sound pickup unit 33 and the second sound pickup unit 35, that is, the first sound pickup unit 33 and the second sound pickup unit 35 are in each frequency band. The intensity of the induction of sound waves.

Further, the equalization pre-processing system 39 includes an equalization calculation unit 391, a storage unit 393, a radio system simulation unit 395, and a compensation processing unit 397. The equalization calculation unit 391 is coupled to the storage unit 393, and the storage unit 393 is coupled to the compensation processing unit 397. The radio system simulation unit 395 is further coupled to the compensation processing unit 397 and the equivalent circuit model establishing unit 31.

The equalization calculation unit 391 receives the first sensitivity curve corresponding to the first sound pickup unit 33 and the second sensitivity curve corresponding to the second sound pickup unit 35.

The equalization calculation unit 391 is configured to equalize the second sensitivity curve to the first sensitivity curve, thereby obtaining a difference value between the first sensitivity curve and the second sensitivity curve, and storing the difference value in the storage unit 393 (for example, establishing a sensitivity difference table) ).

In addition, the equalization calculation unit 391 can further receive the analog sensitivity curve generated by the equivalent circuit model establishing unit 31 (ie, the first analog sensitivity curve corresponding to the first equivalent circuit model), and the first sensitivity obtained by the actual measurement. The curves are compared to confirm the accuracy of the established first equivalent circuit model. In other words, if the sensitivity difference between the first sensitivity curve and the first analog sensitivity is less than the preset difference threshold (ie, the first sensitivity difference threshold), the first equivalent circuit model can accurately simulate the first sounding unit. 33 (ie the first microphone) characteristics. On the contrary, if the difference between the first sensitivity curve and the first analog sensitivity curve is greater than the preset difference threshold (ie, the first sensitivity difference threshold), the equivalent circuit model establishing unit 31 immediately pairs the first equivalent circuit model. The parameters in (ie, the equivalent circuit component parameters shown in Figure 2) are modified.

The radio system simulation unit 395 performs different radio system simulations using the first equivalent circuit model established by the equivalent circuit model establishing unit 31 and outputs a corresponding radio system analog sensitivity curve. Specifically, the radio system simulation unit 395 can design different radios corresponding to the first radio unit 33 by changing the parameters of the equivalent circuit of the sound tube 101 shown in FIG. 2 (ie, the acoustic equivalent circuit 23 of the sound tube). The system architecture, and through simulation analysis, produces an analog sensitivity curve (ie, a third sensitivity curve) corresponding to the architecture of the radio system.

The compensation processing unit 397 generates a third sensitivity curve corresponding to the characteristics of the radio system of the first radio unit 33 to the radio system simulation unit 395, according to the difference between the first sensitivity curve and the second sensitivity curve stored in the storage unit 393. Correspondingly, the third sensitivity curve obtained by the simulation is compensated (for example, the intensity of the sound wave is increased or attenuated in each frequency band), thereby generating a sensitivity curve corresponding to the characteristics of the second sound pickup unit 35 in the sound collection system. (ie the fourth sensitivity curve).

In other words, the audio processing system 30 can obtain the first sensitivity unit 33 and the second sound unit 35 by equalizing the second sensitivity curve of the second sound unit 35 into the first sensitivity curve of the first sound unit 33. The difference in sensitivity between. In addition, the audio processing system 30 further analyzes the characteristics of the different radio systems corresponding to the first radio unit 33 by establishing an equivalent circuit by using the first radio unit 33 of known internal structure configuration, relative size relationship, and material parameters. Then, the audio processing system 30 correspondingly compensates the sensitivity curve of the simulated sound system according to the sensitivity difference between the first sound pickup unit 33 and the second sound pickup unit 35 (for example, the corresponding gain value of the sound wave intensity in each frequency band) Or corresponding to the attenuation value), to obtain the sensitivity of the second radio unit 35 corresponding to different radio systems, and accurately analyze and grasp the radio characteristics of the second radio unit 35, thereby effectively designing and developing a radio system architecture that meets the requirements, for example, The structural design of the sound tube.

It is worth mentioning that the audio processing system 30 is used to analyze the analog condenser microphone receiving system in this embodiment, but the audio processing system 30 can also be applied to analyze the sound receiving system of other types of microphones, for example, piezoelectric. A radio system such as a microphone, a moving microphone or a MEMS microphone, or other radio system with a radio effect. Accordingly, the present invention does not limit the types and physical architectures of the first and second sound pickup units 33, 35. Similarly, the equivalent circuit model establishing unit 31 can establish a corresponding equivalent circuit model according to the physical architecture of the first sound receiving unit 33. In addition, the measurement module 37 can include a test sound source, a speaker, a signal amplifier, an electro-acoustic measurer, and the like, and can capture the first sensitivity curve and the second sensitivity curve in the non-sound box. The method for the first and second sensitivity curves should be inferred by those skilled in the art, and therefore will not be described herein. In addition, the equivalent circuit model establishing unit 31 and the equalizing pre-processing system 39 can be implemented using a simulation software such as MATLAB software.

In summary, the present invention is not limited to the equivalent circuit model establishing unit 31, the first sounding unit 33, the second sounding unit 35, the measuring module 37, and the equalization pre-processing system 39, the intermediate calculating unit 391, the storage unit 393, and the radio The type, physical architecture, and/or implementation of system simulation unit 395 and compensation processing unit 397.

[Example of pre-processing method for radio system]

Next, please refer to FIG. 4 and refer to FIG. 3 at the same time. FIG. 4 is a flowchart of a pre-processing method for a radio system according to an embodiment of the present invention. The pre-processing method can use the Equivalent Circuit Method (ECM) to quickly and accurately simulate and analyze the radio system of the unknown radio unit. In the embodiment, the first sound pickup unit 33 and the second sound pickup unit 35 are implemented by a condenser microphone. In addition, the internal structural parameters of the first sound pickup unit 33 (ie, the first microphone) are known, and the internal structural parameters of the second sound pickup unit 35 (ie, the second microphone) are unknown.

First, in step S10, a first equivalent circuit model corresponding to the internal structure of the first sound pickup unit 33 is established by the equivalent circuit method described in FIG. Next, in step S20, it is determined whether the first equivalent circuit model is accurate. Specifically, the first measurement curve 37 is actually detected and captured by the measurement module 37, and the first analog sensitivity curve SS1 is generated by analyzing the first equivalent circuit model. Then, whether the difference between the first sensitivity curve MS1 and the first analog sensitivity curve SS1 is smaller than the preset first sensitivity difference threshold TH_VAL is determined by the equalization method. If the difference between the first sensitivity curve MS1 and the first pseudo sensitivity curve SS1 is less than the preset first sensitivity difference threshold TH_VAL, it may be determined that the first sound unit equivalent circuit model has accurately simulated the first sound unit 33. Characteristic, step S30 is performed. On the other hand, if the difference between the first sensitivity curve MS1 and the first analog sensitivity curve SS1 is greater than the preset first sensitivity difference threshold TH_VAL, it may be determined that there is an error in the first equivalent circuit model, and the first sound unit 33 cannot be accurately grasped. The characteristic is executed in step S10, corresponding to modifying the equivalent circuit model of the first sound unit.

In step S30, the second sound pickup unit 35 is actually measured by the measurement module 37, and the second sensitivity curve MS2 is captured. Subsequently, the difference between the first sensitivity curve MS1 and the second sensitivity curve MS2 (for example, MS1-MS2) is acquired by the equalization calculation unit 391 in an equalization manner, and a sensitivity difference compensation table is established (step S40). Then, in step S50, the radio system simulation unit 395 performs an analysis simulation of a radio system using the first equivalent circuit model. Specifically, the first sound collection system (ie, the first microphone) is established by integrating the first equivalent circuit model corresponding to the internal structure of the first sound pickup unit 33 and the equivalent sound circuit model of the corresponding sound tube structure. The equivalent circuit model of the radio system (ie, the first radio system equivalent circuit model), through the calculus analysis, simulates a third sensitivity curve SS2 corresponding to the established first radio system.

Then, in step S60, the third sensitivity curve SS2 obtained by the simulation is correspondingly compensated according to the sensitivity difference compensation table to generate a fourth sensitivity curve SS3 corresponding to the second sound pickup unit 35 in the simulated sound system, so as to accurately grasp the corresponding The radio characteristics of the second radio system (i.e., the second microphone radio system) of the two radio units 35 (step S70).

According to this, the optimal sound tube design corresponding to the second sound unit 35 (ie, the second microphone) can be obtained by adjusting the component parameters of the first sound system equivalent circuit model of the first sound system, thereby designing the ideal ideal. The radio system of the second radio unit 35 (i.e., the second microphone radio system) of the radio quality requirement (e.g., the ideal sensitivity curve).

In addition, the accuracy of the simulated fourth sensitivity curve SS3 can be verified by comparing the second radio system sensitivity curve MS3 of the second radio system by constructing the corresponding second radio system.

Incidentally, the pre-processing method for the radio system may further include: comparing the fourth sensitivity curve SS3 with a preset sensitivity curve, for example, determining between the fourth sensitivity curve SS3 and the preset sensitivity curve. The difference is less than the preset sensitivity difference threshold. Then, the parameters of the equivalent circuit of the first radio system (ie, the design of the parameters of the sound tube element) are adjusted correspondingly, and the structural design parameters of the radio system corresponding to the second unit 35 are obtained, thereby achieving the desired radio quality of the second radio system.

In actual implementation, the pre-processing algorithm can be implemented by analog software, such as MATLAB software. In addition, the equalization pre-processing method described in this embodiment is used to analyze the analog condenser microphone radio system, but the audio processing system 30 can also be applied to analyze and simulate other types of microphones, for example, a piezoelectric microphone, as described above. A radio system such as a moving microphone or a micro electromechanical microphone, or a radio system having other radio performance, but the invention is not limited. The first sensitivity difference threshold and the second sensitivity difference threshold may also be set according to actual design requirements.

Therefore, the present invention does not limit the manner of establishing and accurately determining the first equivalent circuit model corresponding to the first sound pickup unit 33, the first sensitivity difference threshold and the second sensitivity difference valve value setting manner, and corresponding to the second sound collection. The actual use and analysis of the fourth sensitivity curve SS3 of the system. It should be noted that FIG. 4 is only a schematic flow chart of the equalization processing method described in the embodiment of the present invention, and is not intended to limit the present invention.

[Possible efficacy of the embodiment]

Referring to FIG. 5 to FIG. 8 , FIG. 5 to FIG. 8 respectively illustrate an unknown microphone receiving system (that is, the second radio unit 35) having different radio characteristics by using the pre-processing method of the radio system according to the embodiment of the present invention. System) Actual measurement and simulation sensitivity curve diagram.

In detail, FIG. 5 to FIG. 8 are schematic diagrams showing the sensitivity curves of the microphone sound collection system having a tube diameter of 4.5 mm (mm) and a tube length of 3 mm, 5 mm, 10 mm, and 20 mm. The curves C1, C3, C5 and C7 are the sensitivity curves of the simulated radio system by using the equalization pre-processing method and the equivalent circuit architecture provided by the embodiments of the present invention. Curves C2, C4, C6 and C8 are the sensitivity curves of the radio system obtained by actual measurement in the no-ring box.

From the analysis results of Fig. 5 to Fig. 8, it can be seen that the sensitivity curve and the peak frequency point obtained by the actual measurement and the equivalent circuit simulation are almost the same, and only the peak sensitivity has a difference of about 4 dB. In addition, the above simulation analysis process can understand the influence of the structural size of the sound tube on the sound receiving system, and the high frequency peak value will increase as the tube length of the sound guiding tube increases, and the resonance frequency point will move to the low frequency to lower the sound receiving system. Receive frequency range. Accordingly, by performing a simulation analysis of a sound pickup unit (for example, a microphone) of an unknown parameter, a sound system that meets the demand for high sound quality (for example, the frequency range of the microphone receiving system) can be designed. In addition, FIG. 5 to FIG. 8 illustrate that the characteristics of the unknown sound pickup unit can be simulated and analyzed by the above-described equalization processing method as long as the equivalent circuit structure is designed to accurately simulate the sound pickup characteristics of the known sound pickup unit and the corresponding sound pickup system. It is worth mentioning that FIG. 5 to FIG. 8 are only schematic diagrams of the sensitivity curve simulation and actual measurement of the radio system with different radio characteristics, and are not intended to limit the present invention.

In summary, the pre-processing method for the radio system provided by the present invention can perform the simulation analysis of the radio system for the radio unit with unknown parameters, and facilitates the electronic product designer to use the pre-formation before the mold development. The processing method quickly and accurately performs the simulation and analysis of the microphone receiving system, thereby effectively grasping the overall radio receiving characteristics of the radio system with the unknown radio unit. Accordingly, the pre-processing method can effectively save the cost and time required for developing the radio system, and can adjust the structure parameters of the radio system to assist in modifying the mechanism design of the radio system in the electronic product, so as to achieve high on the market. The demand for radio quality.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

10. . . Capacitive microphone radio system

101. . . Sound tube

103. . . Rubber mat

105. . . Ventilation paper

107. . . The front cover

109. . . Copper ring

111. . . Vibrating membrane

113. . . Insulating paper

115. . . Back plate

117. . . Plastic ring

119. . . Copper bracket

121. . . Back cavity

123. . . Junction field effect transistor

125. . . capacitance

127. . . Circuit board

20. . . Equivalent circuit of condenser microphone radio system

twenty one. . . Equivalent circuit of air radiation impedance

twenty three. . . Acoustic equivalent circuit of the sound tube

25a. . . Cavity equivalent circuit before microphone unit

25b. . . Cavity equivalent circuit after microphone unit

27. . . Mechanical equivalent circuit of microphone unit

29. . . Electrical equivalent circuit of microphone unit

30. . . Audio processing system

31. . . Equivalent circuit model building unit

33. . . First radio unit

35. . . Second radio unit

37. . . Measurement module

39. . . Equalization pretreatment system

391. . . Equalization unit

393. . . Storage unit

395. . . Radio system simulation unit

397. . . Compensation processing unit

C1~C8. . . curve

S10~S70. . . step

Figure 1 is a cross-sectional view of a typical condenser microphone.

2 is an equivalent circuit diagram of a condenser microphone according to an embodiment of the present invention.

FIG. 3 is a functional block diagram of an equalization pre-processing system for a radio system according to an embodiment of the present invention.

FIG. 4 is a flowchart of a pre-processing method for a radio system according to an embodiment of the present invention.

FIG. 5 is a schematic diagram showing the sensitivity curve of the second microphone sound collection system with a diameter of 4.5 mm and a tube length of 3 mm according to an embodiment of the present invention.

6 is a schematic diagram showing the sensitivity curve of the second microphone sound collection system with a tube diameter of 4.5 mm and a tube length of 5 mm according to an embodiment of the present invention.

7 is a schematic diagram showing the sensitivity curve of the second microphone sound collection system with a tube diameter of 4.5 mm and a tube length of 10 mm according to an embodiment of the present invention.

FIG. 8 is a schematic diagram showing the sensitivity curve of the second microphone receiving system with a diameter of 4.5 mm and a tube length of 20 mm according to an embodiment of the present invention.

S10~S70. . . step

Claims (10)

  1. An equalization pre-processing method for a radio system, adapted to analyze a characteristic of a second radio unit in a radio system by analyzing one of the known internal structure configuration parameters, the method comprising: The first radio unit structure configuration parameter is configured to establish a first equivalent circuit model corresponding to one of the first radio units; measure and acquire a first sensitivity curve of the first radio unit and one of the second radio units a sensitivity curve; equalizing the second sensitivity curve into the first sensitivity curve, and acquiring a difference value between the first sensitivity curve and the second sensitivity curve; simulating the first equivalent circuit model and obtaining The first sound receiving unit is in a third sensitivity curve of the sound receiving system; the third sensitivity curve obtained by the simulation is correspondingly compensated according to the difference value between the first sensitivity curve and the second sensitivity curve; and acquiring the first The second radio unit is in a fourth sensitivity curve of the radio system, and the second radio unit is obtained by analyzing the fourth sensitivity curve. The characteristics of the radio systems.
  2. The pre-processing method for the radio system described in claim 1, further comprising: simulating the first equivalent circuit model, and generating a first analog sensitivity curve; and determining the first simulation Whether the difference value between the sensitivity curve and the first sensitivity curve is less than a preset first sensitivity difference threshold, and the difference between the first analog sensitivity curve and the first sensitivity curve is greater than the preset first When the sensitivity difference threshold is used, the parameters of the first equivalent circuit model are adjusted correspondingly.
  3. The method for processing pre-processing of the radio system according to claim 1, wherein the method further comprises: establishing a sensitivity difference compensation table when the second sensitivity curve is equalized to the first sensitivity curve.
  4. The method for obtaining a pre-processing method for a radio system according to the second aspect of the invention, wherein the third sensitivity curve obtaining step further comprises: using the first equivalent circuit model and a conductive tube equivalent circuit model, Establishing an equivalent circuit model of the first radio system; and calculating and simulating the equivalent circuit model of the first radio system to obtain the third sensitivity curve; wherein the equivalent circuit model of the sound tube is based on a sound tube Built in at least one of the volume, structure, and material parameters.
  5. The pre-processing method for the radio system described in claim 4, further comprising: adjusting at least one of a volume, a structure, and a material parameter of the sound tube according to the fourth sensitivity curve, The difference between the fourth sensitivity curve and a preset sensitivity curve is less than a preset sensitivity difference threshold.
  6. The pre-processing method for a radio system according to claim 1, wherein the first radio unit and the second radio unit are a condenser microphone, a piezoelectric microphone, a moving coil microphone, and a micro-electromechanical device. One of the microphones.
  7. An equalization pre-processing system for a radio system for calculating a first sensitivity curve and a second sensitivity curve of a first radio unit and a second radio unit through a measurement module input, including An equivalent circuit model establishing unit is configured to establish a first equivalent circuit model according to the known internal structure configuration relationship and material parameters of the first sounding unit, and generate a first analog sensitivity curve; first-class calculus a unit for determining the accuracy of the first analog sensitivity curve and equalizing the second sensitivity curve to the first sensitivity curve, and outputting corresponding sensitivity difference data; a storage unit coupled to the equalization calculation unit And storing sensitivity difference data between the first sensitivity curve and the second sensitivity curve; a sound system simulation unit for using the first equivalent circuit model and a sound guide tube corresponding to a sound pipe The circuit model, the simulation generates a third sensitivity curve corresponding to the first radio unit in a radio system; and a compensation processing unit coupled to the storage And the sounding system simulation unit is configured to compensate the third sensitivity curve obtained by the simulation according to the sensitivity difference data between the first sensitivity curve and the second sensitivity curve, and generate the second sounding unit corresponding to the sound One of the fourth sensitivity curves of the system.
  8. The equalization pre-processing system for a radio system according to claim 7, wherein the first equivalent circuit model comprises a plurality of electronic components such as capacitors, resistors and inductors connected in series and in parallel, and a plurality of transformers, wherein These transformers are used for energy conversion between acoustics, mechanics and electricity.
  9. The pre-processing system for a radio system as described in claim 7 of the patent application, wherein the pre-processing system is implemented by MATLAB software.
  10. The equalization pre-processing system for a radio system according to claim 7, wherein the first radio unit and the second radio unit are a condenser microphone, a piezoelectric microphone, a moving coil microphone, and a micro-electromechanical device. One of the microphones.
TW101109309A 2012-03-19 2012-03-19 Method and system of equalization pre-processing for sound receiving system TWI483624B (en)

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